In my experience, people are more likely to take offense when they are given helpful information about something that they are doing wrong, than they are to be grateful for the opportunity to improve, so unless this particular co-worker is a person of unusual wisdom, I would have to advise you not to mention the nose hairs. Just ignore them.
I really don't think his nose hairs affect you in any way, so its none of your business what he does or does not do with them.
Tell the coworker it is not working and if that does not work tell him or her that u will call there partner and tell them what they are doing !!!
just tell him
gee i dont kno...tell them!
Spelling bee! Cheese! Fart! Nosehairs!
The air is not filtered like it is by the nosehairs.
Try to change the subject.
if it doesnt affect you negatively
how can someone smell like sex?????
If it is yes most definately.
Infer that you have exhausted your personal knowledge and refer them to a supervisor.
Do something bad, blame it on them and tell your boss they did it!
Hiring that coworker